In Danish its called: Loppemarked.
Sounds like a bargain! Find some Beovox S45 speakers and you are there. They are great for lower output Beomasteres and sound great. They also fit in with the age of the Beomasteres. What type is the Beomaster 2000 as there is versions?
Avoid the Beovox X and any Beovox that can handle larger output.
You can see the Beovox's on the main Beoworld site under products.